Abstract: Scientific fertilization is one of the key measures to improve the quality of seedlings and yield of qualified seedlings.By using different types of fertilizers and fertilization methods in the field,comparative test about Larix principis-rupprechtii 1a seedlings shows that:(1)In top dressing of urea,ammonium bicarbonate,ammonium nitrate and ammonium sulfate in field,the ammonium sulfate has the best effect.Based on the comparative test the average diameter,seedling height and production are 51.81%,76.19% and 123.52% higher.(2)Basing organic fertilizer has an outstanding influence on the growing of seedlings.The average diameter,seedling height and production are 24.10%,26.84% and 100.00% higher.(3)Using potassium dihydrogen phosphate to foliar fertilizer also has an outstanding influence on the growing of seedlings.The average diameter,seedling height,root length and fibrous root length are 17.27%,25.76%,20.42% and 17.17% higher than those of the former field.

Key words: Larix principis-rupprechtii, 1a seedlings, fertilization effect